What is basic impulse insulation level? And how it is calculated for sub- station?

2 Answers  

---

in a large three phase induction motors usually the value of full load slip is

1 Answers   PSEB,

---

what is the std. earthing resistance for 440V system or m/c, 33000/440 Volt substation? What is the std.?

2 Answers  

---

You are given 220 V supply source, four wires, an ammeter and voltmeter. There is no any indication or description on meters. How will you identify which is ammeter or voltmeter?

7 Answers   ABB,

---

why transformer rating is in kva?

11 Answers  

---

What are the tests to be done on circuit breaker?

1 Answers  

---

What is VCB? where it is installed at SP. What is SP?

0 Answers  

---

What is the formula to calculate the rating of a three phase miniature circuit breaker

0 Answers  

---

can a 50 Hz transformer work satisfactorily if placed under 60 Hz,what are the prices and losses that will arise

5 Answers  

---

Rotor resistance starter is used to obtain= A increased starting torque B decrease starting current C decrease starting loss D increase efficiency

1 Answers  

---

What is the effect on power factor, shown by a trivector meter; incase of reverse phase sequence. If the power factor of a system is lag what meter will show in case of reverse phase sequence connected to the meter. and What in case of lead.

0 Answers   TATA,

---

When generator connected, the circuit ELCB exploded. What is the reson?

3 Answers  

---